Electrospinning apparatus

ABSTRACT

An electrospinning apparatus capable of: forming a buffer section between the respective units of the electrospinning apparatus and installing a vertically movable adjustment roller in the buffer section to adjust the transfer speed and time of a long sheet, which passes through the respective units, for each section and prevents the crumpling, sagging, snapping, breakage, and damage of the elongated sheet, avoiding abnormal transfer of the elongated sheet due to electrostatic attraction during electrospinning and, in a nanofiber production step, disposing an apparatus for detecting the sagging of the elongated sheet before and after a spinning zone, detecting the sagging of the elongated sheet, and transmitting the signal to an apparatus for assisting the transfer of the elongated sheet so as to adjust the transfer speed of the elongated sheet. This automatically improves the sagging of the sheet and thereby effectively prevent the problem caused by the sagging of the sheet.

TECHNICAL FIELD

The present invention relates to electrospinning apparatus capable of:sensing a sagging of an elongated sheet which carries electrospinnedpolymer spinning solution so as to adjust the carrying speed and time ofthe elongated sheet, assisting carrying of the sheet, controlling thecarrying speed, discharging amount of a nozzle block, and voltageintensity, thereby mass-producing of nanofiber having uniform airpermeability and uniform thickness.

BACKGROUND ART

Generally, Nano Fiber refers to a Micro Fiber having an average diameterof tens to hundreds nm, products including nanofiber such as non-wovenfabric, membrane, and braid are widely used as consumer goods,agricultural, clothing, and industrial ways.

Moreover, nanofiber is used in various fields such as artificialleather, suedette, sanitary pads, clothing, diapers, packing materials,general goods materials, various filter materials, medical use materialsin gene transporting, bulletproof jacket, and other national defense usematerials.

As stated above, nanofiber is produced by electric field. In otherwords, nanofiber applies polymer substance which is raw material to highvoltage electric field occurring electric repulsive force inside polymersubstance, so molecular agglomerate, split into nano size thread, andnanofiber is manufactured and produced.

In this case, as the stronger electric field is, polymer substance canbe thinly torn, 10 to 1000 nm thickness of nanofiber can be acquired.

The electrospinning apparatus which manufactures and produces nanofiberwith such thickness comprises a spinning solution main tank fillingspinning solution, a metering pump for the required amount of spinningsolution, a nozzle block with several nozzles arranged and installed todischarge spinning solution, and a collector located at the bottom ofnozzle integrated spinning fiber and a power supply device generatingvoltage.

Nanofiber manufacturing method comprising the structure stated above isdisclosed in U.S. Pat. No. 4,044,404. Also, The electrospinningapparatus made up of the structure as described above is illustrated inFIG. 1, comprising a spinning solution main tank (not shown) filledspinning solution, a metering pump (not shown) which is for the requiredamount of supply on polymer spinning solution inside the spinningsolution main tank, a nozzle block (111) discharging polymer spinningsolution inside the spinning solution main tank, and arranged andinstalled several nozzles (112) in pin form, and a collector (113)located above the nozzle (112) to integrate jetted polymer spinningsolution and has predetermined space separated from the nozzle (112),and a unit (110) including a power supply device (114) generated highvoltage at the collector (113).

Nanofiber manufacturing method by the electrospinning apparatus (100)includes the step of: consecutively supplying the required amount ofspinning solution by metering pump from the spinning solution main tankinto several nozzles (112) provided high voltage, forming a nanofiberweb by spinning and aggregating the spinning solution supplied throughseveral nozzles (112) on the collector with high voltage, formingnanofiber web on the elongated sheet (115) carried through theelectrospinning apparatus's (100) units (110), the elongated sheet whichlaminating formed the nanofiber web passes through each unit (110),repeatedly laminating the nanofiber web and producing non-woven fiber bylaminating, embossing, or needle punch.

Here, the electrospinning apparatus is divided into a bottom-upelectrospinning apparatus, a top-down electrospinning apparatus, and aparallel electrospinning apparatus by the located direction on acollector. In other words, the electrospinning apparatus is divided intoa bottom-up electrospinning apparatus which includes a collector locatedover a nozzle and can produce equal and relatively thin nanofiber, atop-down electrospinning apparatus which includes a collector locatedbelow the nozzle, produces relatively thick nanofiber, and can increasethe production of nanofiber per hour, and a parallel electrospinningapparatus which comprises nozzles and collector arranged in paralleldirection.

Meanwhile, the electrospinning apparatus comprises composition ofjetting spinning solution by a nozzle block's nozzle, and jettedspinning solution laminates on upper side or lower side of a memberforming a nanofiber web.

According to the composition as stated above, the electrospinningapparatus inside which one unit jets spinning solution by a nozzle,carrying the elongated sheet which laminating forms a nanofiber web tothe inside of a different unit, the elongated sheet which is carried tothe inside of a different unit jets spinning solution by the nozzle andagain laminating forming a nanofiber web, by repeatedly performing theprocess produces a nanofiber web.

However, in the electrospinning apparatus's each of the unit, in thecase carrying speed of the elongated sheet on which a nanofiber web islaminated and formed is different according to each section, there areproblems such as the elongated sheet is wrinkled, or slacked, etc.

In other words, in the case of carrying speed of the elongated sheetlaminating forming a nanofiber web in the unit located at theelectrospinning apparatus front-end and carrying speed of the elongatedsheet laminating forming a nanofiber web in the unit located at therear-end are different, there are problems such as the elongated sheetis wrinkled, or slacked, etc., and because of this, there are problemssuch as the elongated sheet is cut, or a property of matter is debased,or device driving is stopped.

In more detail, in the case of carrying speed of the elongated sheetlaminating forming a nanofiber web in the unit located at theelectrospinning apparatus front-end is fast, and carrying speed of theelongated sheet laminating forming a nanofiber web in the unit locatedat the rear-end is slow, there are problems such as the elongated sheetis wrinkled, or slacked. On the other hand, in the case of carryingspeed of the elongated sheet laminating forming a nanofiber web in theunit located at the electrospinning apparatus front-end is slow, andcarrying speed of the elongated sheet laminating forming a nanofiber webin the unit located at the rear-end is fast, there are problems such asthe elongated sheet is cut, or a device driving is stopped, and becauseof this, overall a nanofiber web's property of matter is debased.

Meanwhile, as stated above, when manufacturing a nanofiber using theelectrospinning apparatus, spinning solution is consecutively suppliedto a nozzle high voltage is applied to and there is problem such asprovided electric force's effect is lowered.

In other words, as electric force provided at nozzle is jetted asspinning solution, electric force can't overcome spinning solution'sinterfacial tension, and fiber forming effect by electric force islowered. So, Droplet phenomenon which spinning solution fell in dropletform is occurred, product quality is debased, and there is difficulty innanofiber mass production which makes commercialization impossible.

In order to solve this problem, if maximize effect of electric forcewhich is provided to the electrospinning apparatus's nozzle block,electric force is larger than spinning solution's interfacial tension,and fiber forming effect is increased. This enables mass production ofnanofiber, prevent droplet phenomenon effectively, and suggestsbottom-up and top-down electrospinning apparatus which produce highquality nanofiber. By flowing high voltage each to the collector and thenozzle block discharging spinning solution, fiber forming effect can beenhanced. However, electrostatic attraction is increased due to highvoltage, the elongated sheet on which a nanofiber web is stacked isattached to the collector, only with the elongated sheet carrying deviceincluded in the electrospinning apparatus, it is hard to overcome suchelectrostatic attraction, so nanofiber cannot be mass produced.

In order to solve this problem, an auxiliary carrying device issuggested which comprising an auxiliary belt assisting an elongatedsheet carrying between a collector with high voltage and a nozzle block.However, in order to rotate the auxiliary belt according to theelongated sheet carrying speed, not only a driving device which directsthe electrospinning apparatus but also separate driving device should beinstalled in addition. Therefore, there are problems such as the processis complex and the cost is increased.

Meanwhile, when manufacturing nanofiber, in the case the elongated sheetattached to the collector is slacked, due to nanofiber uneven stack,there is problem such as the quality is decreased. In the case ofwinding the elongated sheet which is slacked, there is difference infirmness of winding occurs, so a wound roll is modified, or wrinkled.

In order to solve this, as one method to sense slacking of carryingelongated sheet, Japanese laid-open Patent Publication No. 2011-33229discloses a method of assessing slaking of an elongated sheet by sendingcompressed air to a elongated sheet. However, there are problems such asair pollutant attaches to an air outlet opening sending compressed air,diameter of a hole is changed, measurement error occurs.

Here, in order to sense slacking of an elongated sheet, Korean laid-openPatent Publication No. 2010-0123820 discloses technology of assessing asheet slacking by pressing and putting a touch roller on the surface ofan elongated sheet, and measuring displacement of a touch roller inorder to sense slacking of carrying elongated sheet. However, because anelongated sheet tension is evaluated using a contact roller, there areproblems such as pollution and modification of nanofiber property ofmatter as according to electro spinning direction, spin nanofibercontacts a roller.

Meanwhile, when manufacturing nanofiber through the electrospinningapparatus, factors determining nanofiber feature are matter feature suchas spinning material concentration, dielectric property, and surfacetension, and control parameter such as distance between a nozzle and acollector, voltage between a nozzle and a collector, charge density ofelectrical field, electrostatic pressure in a nozzle, and injectionspeed of spinning material. Japanese laid-open Patent publication No.2008-274522 discloses manufacture of nanofiber with uniform matter byadjusting such spinning condition. However, since it is not easy toconstantly maintain electro spinning condition for a long time, massproduction of nanofiber with uniform air permeability and thickness isstill difficult.

DISCLOSURE Technical Problem

The present invention is contrived to solve the problem stated above,buffer section is formed between the electrospinning apparatus each ofthe unit. By installing an adjusting roller which is movable betweenupper and lower side in buffer section, carrying speed and carrying timeof an elongated sheet going through each unit could be adjustableaccording to section, and the crumpling, sagging, snapping, breakage,and damage of the elongated sheet are prevented. In the process ofelectrospinning, solve the elongated sheet not smoothly carrying problemoccurred due to electrostatic attraction, and allocate device sensingslacking of the elongated sheet near spinning zone. By sensing saggingof the elongated sheet, transmit the signal to device assisting theelongated sheet carrying, based on the sensing signal, adjustingcarrying speed of the collector fixed with the collector byelectrostatic attraction, automatically improve sheet slacking andprevent problem due to slacking of sheet. Accordingly, theelectrospinning apparatus aims to produce nanofiber with uniformquality.

Also, an auxiliary belt assisting carrying of the elongated sheeteliminates separate driving device, and instead supported by a rollerhaving low friction coefficient. The auxiliary belt could be rotatedonly with driving force of conventionally installed elongated sheetcarrying roller, and by solving the elongated sheet carrying problem,mass-producing of nanofiber with uniform quality is possible withoutauxiliary power. To solve not smoothly carrying problem of an elongatedsheet caused by an electrostatic attraction in electro spinning process,auxiliary carrying device is allocated in spinning zone, and roller withlow friction coefficient is used to comprise an auxiliary carryingdevice, it aims to provide an electrospinning apparatus which can carryan elongated sheet without separate driving device.

Moreover, it aims to provide a carrying speed (V) control device whichcontrol carrying speed (V) based on air permeability value and thicknessvalue of nanofiber, which stacked on an elongated sheet carrying indesired speed (V), measured by using air permeability measuring deviceand ultrasound thickness measuring device respectively, and theelectrospinning apparatus which can mass-produce nanofiber with uniformair permeability and thickness by controlling discharge amount jettedfrom a nozzle block and the number of nozzle.

Technical Solution

To attain the purpose stated above, the present invention is theelectrospinning apparatus for manufacturing nanofiber by jettingspinning solution on the elongated sheet on the collector in each of theunit through nozzle, comprising one or more in series arranged unit;provided in unit, a case comprising electric conductor or non-conductor;provided in the case, a nozzle block which arranges a plurality ofnozzles in pin form; a collector collecting spun and jetted polymerspinning solution which is located and installed over the nozzle blockwith a predetermined distance apart; a voltage generating device whichconnects − terminal to the nozzle block and + (plus) terminal to thecollector; an elongated sheet located between the nozzle block and thecollector, moves in desired speed, and polymer spinning solutionnanofiber discharged from the nozzle block is stacked and laminated on;an auxiliary belt which moves the elongated sheet in desired carryingspeed; and an auxiliary belt roller which supports and simultaneouslyoperates the auxiliary belt, and further comprising buffer sectionformed between each of the unit, a pair of support roller supporting theelongated sheet on the buffer section, and an elongated sheet carryingspeed adjusting system including one or more adjusting roller which isinstalled between a pair of support roller, movable between upper andlower side, and winding the elongated sheet, and according to themovement of each adjusting roller, the elongated sheet carrying speedaccording to each of the unit is adjusted.

Here, elongated sheet carrying speed adjusting system further comprisesa sensing sensor for sensing carrying speed of the elongated sheetinside each of the unit, and a main control device which controls anadjusting roller movement according to sensed elongated sheet carryingspeed in each unit.

Moreover, carrying speed is sensed by the sensing sensor, in the casecarrying speed of the elongated sheet located in the unit of front-endis faster than carrying speed of the elongated sheet located in the unitof rear-end of the unit, the main control device moves the adjustingroller provided between a pair of the support roller to lower side,carrying speed of the elongated speed located in the unit of front-endand the carrying speed of the elongated sheet located in the unit ofrear-end are modified and controlled to the same level.

Also, carrying speed is sensed by the sensing sensor, in the case by thesensing sensor carrying speed of the elongated sheet located in the unitof front-end is slower than carrying speed of the elongated sheetlocated in the unit of rear-end, the main control device moves theadjusting roller provided between a pair of the support roller to upperside, carrying speed of the elongated speed located in the unit offront-end and the carrying speed of the elongated sheet located in theunit of rear-end are modified and controlled to the same level.Meanwhile in the electrospinning apparatus comprising one or more inseries arranged unit; provided in unit, a case comprising electricconductor or non-conductor; provided in the case, a nozzle block whicharranges a plurality of nozzles in pin form; a collector collecting spunand jetted polymer spinning solution which is located and installed overthe nozzle block with a predetermined distance apart; a voltagegenerating device which connects − terminal to the nozzle block and +terminal to the collector; an elongated sheet located between the nozzleblock and the collector, moves in desired speed, and polymer spinningsolution nanofiber discharged from the nozzle block is stacked andlaminated on; an auxiliary belt which moves the elongated sheet indesired carrying speed; and an auxiliary belt roller which supports andsimultaneously operates the auxiliary belt, the auxiliary belt rollercomprises a roller with low friction coefficient, and without separatedriving device, assists carrying of the elongated sheet.

Here, one or more auxiliary belt roller is provided.

Moreover, the auxiliary belt roller comprises one among low frictioncoefficient rolling bearing, oil bearing, ball bearing, roller bearing,sliding bearing, sleeve bearing, hydrodynamic journal bearing,hydrostatic journal bearing, pneumatic bearing, air dynamic bearing, airstatic bearing, or air bearing.

In addition, through adjusting the auxiliary belt roller upper and lowerlevel, discharge amount of nanofiber stacked on the elongated sheet isadjusted.

Meanwhile, in the electrospinning apparatus comprising one or more inseries arranged unit; provided in unit, a case comprising electricconductor or non-conductor; provided in the case, a nozzle block whicharranges a plurality of nozzles in pin form; a collector collecting spunand jetted polymer spinning solution which is located and installed overthe nozzle block with a predetermined distance apart; a voltagegenerating device which connects − terminal to the nozzle block and +terminal to the collector; an elongated sheet located between the nozzleblock and the collector, moves in desired speed, and polymer spinningsolution nanofiber discharged from the nozzle block is stacked andlaminated; an auxiliary belt which moves the elongated sheet in desiredcarrying speed; and an auxiliary belt roller which supports andsimultaneously operates the auxiliary belt, further comprising a sheetslacking sensing device which senses slacking of the elongated sheet infront and rear side of each unit; and an auxiliary belt driving devicewhich receives signal from the auxiliary belt driving device andcontrols the speed of the auxiliary belt roller in each unit.

Here, the sheet slacking sensing device is among one of optic sensor,ultrasonic sensor, image sensor, or tension meter. Also, the auxiliarybelt driving device is motor.

In the electrospinning apparatus comprising one or more in seriesarranged unit; provided in unit, a case comprising electric conductor ornon-conductor; provided in case, a nozzle block which arranges aplurality of nozzles in pin form; a collector collecting spun and jettedpolymer spinning solution which is located and installed over the nozzleblock with a predetermined distance apart; and spins and jets; a voltagegenerating device which connects − terminal to the nozzle block and +terminal to the collector; an elongated sheet located between the nozzleblock and the collector, moves in desired speed, and polymer spinningsolution nanofiber discharged from the nozzle block is stacked andlaminated; an auxiliary belt which moves the elongated sheet in desiredcarrying speed; and an auxiliary belt roller which supports andsimultaneously operates the auxiliary belt, further comprising a sheetslacking sensing device which senses slacking of the elongated sheet infront and rear side of each of the unit.

Here, the sheet slacking sensing device is among one of optic sensor,ultrasonic sensor, image sensor, or tension meter. Also, the auxiliarybelt driving device is motor.

Meanwhile, in the electrospinning apparatus comprising one or more inseries arranged unit; provided in unit, a case comprising electricconductor or non-conductor; provided in the case, a nozzle block whicharranges a plurality of nozzles in pin form; a collector collecting spunand jetted polymer spinning solution which is located and installed overthe nozzle block with a predetermined distance apart; a voltagegenerating device which connects − terminal to the nozzle block and +terminal to the collector; an elongated sheet located between the nozzleblock and the collector, moves in desired speed, and polymer spinningsolution nanofiber discharged from the nozzle block is stacked andlaminated; an auxiliary belt which moves the elongated sheet in desiredcarrying speed; and an auxiliary belt roller which supports andsimultaneously operates the auxiliary belt, further comprising airpermeability measuring device for measuring permeability of nanofiberlaminating formed on the elongated sheet in each unit, carrying speed ofthe elongated sheet which nanofiber is laminated and formed iscontrolled, or the nozzle block discharge amount is controlled, or thevoltage generating device voltage is controlled.

Here, the elongated sheet carrying speed control or the nozzle blockdischarge amount control or the voltage generating device voltagecontrol is based on deviation between air permeability measured from thepermeability measuring device and desired goal permeability

In this case, the air permeability measuring device measures airpermeability of nanofiber laminating forming on the elongated sheet byultrasonic wave.

Meanwhile, the electrospinning apparatus comprising one or more inseries arranged unit; provided in unit, a case comprising electricconductor or non-conductor; provided in the case, a nozzle block whicharranges a plurality of nozzles in pin form; a collector collecting spunand jetted polymer spinning solution which is located and installed overthe nozzle block with a predetermined distance apart; a voltagegenerating device which connects − terminal to the nozzle block and +terminal to the collector; an elongated sheet located between the nozzleblock and the collector, moves in desired speed, and polymer spinningsolution nanofiber discharged from the nozzle block is stacked andlaminated; an auxiliary belt which moves the elongated sheet in desiredcarrying speed; and an auxiliary belt roller which supports andsimultaneously operates the auxiliary belt, further comprising athickness measurement device for measuring thickness of nanofiberlaminating forming on the elongated sheet in each unit, carrying speedof the elongated sheet laminating forming nanofiber is controlled, orthe nozzle block discharge amount is controlled, or voltage from thevoltage generating device is controlled.

Here, the elongated sheet carrying speed control or the nozzle blockdischarge amount control or the voltage generating device voltagecontrol is based on deviation between thickness measured from thethickness measurement device and desired goal thickness.

In this case, the thickness measurement device measures thickness ofnanofiber laminating forming on the elongated sheet by measuringlongitudinal wave and transverse wave of ultrasound.

Advantageous Effects

The present invention having the structure as explained above, couldadjust carrying speed and carrying time of the elongated sheet goingthrough each unit, because of this, it can prevent the crimpling,sagging, snapping, breakage, and damage of the elongated sheet carriedfrom each unit. Also, the carrying speed of the elongated sheet in theunit of front end and that of rear-end unit could respectively beadjusted and controlled, not only variously adjust thickness of thenanofiber web laminated on the elongated sheet but also form uniformdistribution of nanofiber web laminated on upper side of the elongatedsheet. Moreover, nanofiber web matter could be improved, deviceoperation convenience and nanofiber web product reliability could beenhanced. Even more, by automatically sensing and solving of theslacking of the elongated sheet, uniformity spinning of nanofiber due tothe elongated sheet carrying problem is prevented, and thereby highquality nanofiber with uniform matter can be manufactured.

In addition, in the present invention, solving the problem of slowedcarry of the elongated sheet caused by attaching to the collector, itprevents lack of uniformity spinning of nanofiber due to the elongatedsheet carry imbalance, moves the auxiliary belt in upper and lowerdirection, adjusts the distance with the spinning nozzle, effectivelycontrols nanofiber stack amount, and manufactures high quality nanofiberwith uniform matter. Moreover, based on permeability and thicknessmeasured by the permeability measuring device and the thicknessmeasurement device, enables to control the elongated sheet carryingspeed and the nozzle block, and enables mass-producing of nanofiberhaving uniform permeability and thickness during long time electrospinning.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a drawing schematically illustrating an electrospinningapparatus according to the related art,

FIG. 2 is a drawing schematically depicting an elongated sheet carryingspeed adjusting system according to the first exemplary embodiment ofthe present invention,

FIG. 3 and FIG. 4 are drawings schematically showing the elongated sheetcarrying speed adjusting system operation process, in the case carryingspeed of the elongated sheet located at the unit of the front end isfaster than the elongated sheet located at the unit of the rear endaccording to the first exemplary embodiment of the present invention,

FIG. 5 and FIG. 6 are drawings schematically showing the elongated sheetcarrying speed adjusting system operation process, in the case carryingspeed of the elongated sheet located at the unit of front end is slowerthan the elongated sheet located at the unit of the rear end accordingto the first exemplary embodiment of the present invention,

FIG. 7 is a drawing schematically depicting an auxiliary belt devicecomprising an auxiliary belt roller with low friction coefficientaccording to the second exemplary embodiment of the present invention,

FIG. 8 is a drawing schematically showing three auxiliary belt rollersin an auxiliary belt device comprising an auxiliary belt roller with lowfriction coefficient according to the second exemplary embodiment of thepresent invention,

FIG. 9 is a drawing schematically depicting four auxiliary belt rollersin an auxiliary belt device comprising an auxiliary belt roller with lowfriction coefficient according to the second exemplary embodiment of thepresent invention,

FIG. 10 is a drawing schematically depicting five auxiliary belt rollersin an auxiliary belt device comprising an auxiliary belt roller with lowfriction coefficient according to the second exemplary embodiment of thepresent invention,

FIG. 11 is a drawing schematically showing bearing included in anauxiliary belt roller with low friction coefficient according to thesecond exemplary embodiment of the present invention,

FIG. 12 is a drawing schematically illustrating an elongated sheetslacking sensing device in an auxiliary belt device having threeauxiliary belt rollers according to the third exemplary embodiment ofthe present invention,

FIG. 13 is a drawing schematically depicting an elongated sheet slackingsensing device in an auxiliary belt device having five auxiliary beltrollers according to the third exemplary embodiment of the presentinvention,

FIG. 14 is a drawing schematically showing the elongated sheet slackingsensing device provided with the electrospinning apparatus according tothe third exemplary embodiment of the present invention,

FIG. 15 is a process schematic diagram schematically showing the thirdexemplary embodiment of the present invention,

FIG. 16 is a process schematic diagram schematically showing the fourthembodiment of the electrospinning apparatus,

FIG. 17 is a schematic diagram schematically illustrating a nozzle blockof the electrospinning apparatus according to the fourth embodiment ofthe electrospinning apparatus,

FIG. 18 is a process schematic diagram schematically showing the fifthembodiment of the electrospinning apparatus,

DESCRIPTION OF REFERENCE NUMBERS OF DRAWINGS

-   1: electrospinning apparatus,-   3: supply roller,-   5: winding roller,-   10, 10′, 10″, 10′″: unit,-   11: nozzle block,-   12: nozzle,-   13: collector,-   14: voltage generating device,-   15, 15 a, 15 b: elongated sheet-   16: auxiliary belt,-   17: carrying roller,-   17′: auxiliary belt roller,-   18: auxiliary belt driving device,-   19 a: sheet slacking sensing device,-   19 b: air permeability measuring device,-   19 c: thickness measurement device,-   23, 28: auxiliary roller,-   24, 25, 26, 27: driving roller-   29: heating device,-   30: elongated sheet carrying speed adjusting system-   31: buffer section,-   33, 33′: support roller,-   35: adjusting roller,-   41: overflow solution storage tank,-   43: tubular body,-   44: polymer solution storage tank,-   45: polymer solution circulation pipe,-   50: main control device,-   60: nozzle block discharging amount control device,-   61: nozzle block discharging amount control device connection.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Below reference to a drawing attaching a desirable embodiment of thepresent disclosure and explains in detail. Also, the present embodimentdoesn't limit the present disclosure extent of a right, but merelysuggests an example, various modifications in the extent of not leavingthe technological main point is possible.

FIG. 2 is a drawing schematically depicting an elongated sheet carryingspeed adjusting system, FIG. 3 and FIG. 4 are drawings schematicallyshowing the elongated sheet carrying speed adjusting system operationprocess, in the case of carrying speed of the elongated sheet located atthe unit of front-end is faster than the elongated sheet located at theunit of rear-end, FIG. 5 and FIG. 6 are drawings schematically showingthe elongated sheet carrying speed adjusting system operation process,in the case of carrying speed of the elongated sheet located at the unitof front-end is slower than the elongated sheet located at the unit ofrear-end, FIG. 7 is a drawing schematically depicting an auxiliary beltdevice comprising an auxiliary belt roller with low frictioncoefficient, FIG. 8 is a drawing schematically showing three auxiliarybelt rollers in an auxiliary belt device comprising an auxiliary beltroller with low friction coefficient, FIG. 9 is a drawing schematicallydepicting four auxiliary belt rollers in an auxiliary belt devicecomprising an auxiliary belt roller with low friction coefficient, FIG.10 is a drawing schematically depicting five auxiliary belt rollers inan auxiliary belt device comprising an auxiliary belt roller with lowfriction coefficient, FIG. 11 is a drawing schematically showing bearingincluded in an auxiliary belt roller with low friction coefficient, FIG.12 is a drawing schematically illustrating an elongated sheet slackingsensing device in an auxiliary belt device having three auxiliary beltrollers, FIG. 13 is a drawing schematically depicting an elongated sheetslacking sensing device in an auxiliary belt device having fiveauxiliary belt rollers, FIG. 14 is a drawing schematically showing theelongated sheet slacking sensing device provided with theelectrospinning apparatus, FIG. 15 is a process schematic diagramschematically showing the embodiment of the electrospinning apparatus,FIG. 16 is a process schematic diagram schematically showing the fourthembodiment of the electrospinning apparatus, FIG. 17 is a schematicdiagram schematically illustrating a nozzle block of the electrospinningapparatus, and FIG. 18 is a process schematic diagram schematicallyshowing the fifth embodiment of the electrospinning apparatus.

As illustrated in the drawing, the electrospinning apparatus (1)according to the present invention of the first embodiment comprises theelongated sheet carrying speed adjusting system (30) which is installedin the electrospinning apparatus (1), adjusts and controls the carryingspeed and carrying time of the elongated sheet (15, 15′) carried fromeach of the unit (10, 10′) according to each of the unit (10, 10′)

Here, the electrospinning apparatus (1) comprises a spinning solutionmain tank (not shown) which fills spinning solution inside, a meteringpump (not shown) to supply the required amount of polymer spinningsolution filled in the spinning solution main tank, a nozzle block (11)having plurality of pin type formed nozzles (12) to discharge polymerspinning solution inside the spinning solution main tank, a collector(13) which is installed separately in predetermined space from thenozzle (12) to collect spinning solution jetted from the nozzle bock(11)'s nozzle (12) and a unit (10) containing inside a power supplydevice (14) which generates voltage to the collector (13).

Meanwhile, spinning solution supplied through the nozzle (12) inside theunit (10) is composed of solute and solvent, for solute is polymerincluding siloxane alone or combination of siloxane and selected coupleramong monomethacrylate, vinyl, hydride, distearate,bis(1,2-hydroxymethyl), methoxy, ethoxylate, propoxylate, diglycidylether, monoglycidyl ether, monohydroxyalkyl, bishydroxyalkyl, chlorineand bis((aminoethyl-aminopropyl)dimethoxysilyl)ether. It is preferablyselected one or more among polyvinylidene fluoride, polyvinylidenefluoride-hexafluoropropylene copolymer, composite composition thereof,polyamide, polyimide, polyamideimide, poly(meta-phenyleneisophthalamide), meta-aramid, poly Ethylene ChloroTriFluoroEthylene,polyChloroTriFluoroEthylene, Poly(methyl methacrylate),polyacrylonitrile, polyvinylidene chloride-acrylonitrile copolymer andpolyacrylamide. Solvent is preferably composed of one or more amongphenol, formic acid, sulfuric acid, m-cresol, trifluoroaceticanhydride/dichloromethane, water, N-methylmorpholine N-oxide,chloroform, tetrahydrofuran, and an aliphatic ketone group such asmethyl isobutyl ketone and methyl ethyl ketone, an aliphatic hydroxylgroup such as m-butyl alcohol, isobutyl alcohol, methyl alcohol andethanol, an aliphatic compound group such as hexane, tetrachloroethyleneand acetone, a glycol group such as propylene glycol, a diethyleneglycol and ethylene glycol, a halogen compound group such astrichloroethylene and dichloromethane, an aromatic compound group suchas toluene and xylene, an alicyclic compound group such ascyclohexanone, cyclohexane, a ester group such as n-butyl acetate andethyl acetate, an aliphatic ether group such as butyl cellosolve, aceticacid 2-ethozyethanol and 2-ethoxyethanol, and an amide group such asdimethylformamide and dimethylcetamide.

The electrospinning apparatus (1) by the structure according to thefirst exemplary embodiment of the present invention, fixed amount ofspinning solution filled in the spinning solution main tank inside theunit (10) is consecutively provided in the several nozzles (12) providedwith high voltage through a metering pump, polymer's spinning solutionis provided by the nozzle (12) spins and collects on the collector (13)with high voltage flowing through the nozzle (12) and nanofiber web (notshown) is formed, formed nanofiber web is laminating and produced tonon-woven fabric, filter, etc.

In this case, on the electrospinning apparatus′(1) collector (13) isprovided with the elongated sheet (15) for preventing sagging andcarrying a nanofiber web which is formed on the collector (13) whenjetting spinning solution, the elongated sheet (15) is wound by thesupply roller (3) which is provided on the one side of anelectrospinning apparatus and the winding roller (5) provided on theother end.

In the embodiment of the present invention, though polymer spinningsolution is jetted on the elongated sheet (15) located on the collector(13) through the electrospinning apparatus (1) nozzle (12) and comprisedforming a nanofiber web, it is possible that seperate supporter (notshown) is supplied on the elongated sheet (15), separate supply roller(not shown) is provided for providing the supporter, the nozzle (12)spinning solution is jetted on the supporter to form a nanofiber web.

Here, the supporter laminating polymer spinning solution which is jettedfrom the electrospinning apparatus (1) the nozzle (12) is preferablycomprising non-woven fabric or fabric etc, but it is not limited tothis.

Meanwhile, the collector (13) outer side is provided with the auxiliarybelt (16), the collector (13) both ends in the direction of length areeach provided with a carrying roller (17), the auxiliary belt (16) isdriven by the carrying roller's (17) rotation, by driving of theauxiliary belt (16) the elongated sheet (15) is carried from the frontof the electrospinning apparatus (1) to the rear.

According to the structure, spinning solution filled in the inside ofthe electrospinning apparatus (1) unit's spinning solution main tank isjetted on the collector's (13) elongated sheet (15) by the nozzle (12),nanofiber web is formed as spinning solution jetted on the elongatedsheet (15) is laminated, the elongated sheet (15) is carried by theauxiliary belt (16) driving by the carrying roller (17) rotationprovided with on both ends of the collector (13) and located insideanother unit (10′), by repeatedly performing the process a finalproduction is produced.

In this case, the nozzle block's (11) nozzle's (12) outlet is formed inthe upward direction, the collector (13) is located in the upper side ofthe nozzle block (11) and spins spinning solution in the upwarddirection. In the embodiment of the present invention, theelectrospinning apparatus (1) is composed of a bottom-up electrospinningapparatus which spins spinning solution in the upward direction, but itis also possible to comprise a top-down electrospinning apparatus whichspins spinning solution in the downward direction.

Here, the elongated sheet carrying speed adjusting system (30) comprisesa buffer section (31) formed between each of the unit (10, 10′) of theelectrospinning apparatus (1), a pair of support roller (33, 33′) whichsupports the elongated sheet (15) provided on the buffer section (31),and an adjusting roller (35) provided between the pair of the supportroller (33, 33′)

In this case, the support roller (33, 33′) supports carrying of theelongated sheet (15) when carrying the elongated sheet (15) on which ananofiber web is laminated and formed by nozzle jetted spinning solutionin each of the unit (10, 10′), each of them is provided in front-end andrear-end of the buffer section (31) formed between each of the unit (10,10′).

Moreover, the adjusting roller (35) is provided between a pair of thesupport roller (33, 33′), the elongated sheet (15) is winding, by theadjusting roller (35) upper, lower movement, the carrying speed andcarrying time of the elongated sheet (15 a, 15 b) according to each ofthe unit (10, 10′) are adjusted.

For this, a sensing sensor (not shown) for sensing the elongated sheet(15 a, 15 b) carrying speed in each of the unit (10, 10′) is provided,and the main control device (50) is provided as illustrated in FIG. 16in order to control the adjusting roller (35) movement according tocarrying speed of the elongated sheet (15 a, 15 b) in each of the unit(10, 10′) sensed by the sensing sensor.

Though in the embodiment of the present invention, carrying speed of theelongated sheet (15 a, 15 b) in each of the unit (10, 10′) is sensed,according to the sensed carrying speed of the elongated sheet (15 a, 15b), the main control device (50) controls the adjusting roller (35)movement, in order to carry the elongated sheet (15 a, 15 b), anauxiliary belt (16) provided on one side of the collector (13), or acarrying roller (17) for driving the auxiliary belt (16), or a motor(not shown) driving speed is sensed, and according to this, it ispossible to comprise the main control device (50) controlling themovement of the adjusting roller (35).

By the structure stated above, by the sensing sensor, in the case ofcarrying speed of the elongated sheet (15 a) located in front-end of theunit (10) is faster than carrying speed of the elongated sheet (15 b)located in the unit of rear end (10′), the main control device (50)moves the adjusting roller (35) provided between a pair of the supportroller (33, 33′) to lower side, carrying speed of the elongated speed(15 a) located in the unit of front end (10) and the carrying speed ofthe elongated sheet (15 b) located in the unit of rear-end (10′) aremodified and controlled to the same level.

In other words, in the case of sensed carrying speed of the elongatedsheet (15 a) located in the unit of front-end (10) is faster thancarrying speed of the elongated sheet (15 b) located in the unit ofrear-end (10′), in order to prevent slacking of the elongated sheet (15a) carried in the unit (10) located in front-end, the adjusting roller(35), provided between a pair of the support roller (33, 33′) and windthe elongated sheet, is moved to the lower side, among the elongatedsheet (15) carried from the unit (10) located in front-end to the unit(10′) located in rear-end, the elongated sheet (15 a), carried to outerside of the unit (10) in front-end and excessively carried to the buffersection (31) located between each of the unit, is pulled, carrying speedof the elongated speed located in front-end of the unit and the carryingspeed of the elongated sheet located in rear-end of the unit aremodified and controlled to the same level, and thereby slacking andcrumpling of the elongated sheet (15 a) are prevented.

According to the structure stated above, by adjusting carrying speed ofthe elongated sheet (15 a) carried in the unit of front end (10) amongeach of the unit (10, 10′), carrying speed of the elongated speed infront-end of the unit and carrying speed of the elongated sheet inrear-end of the unit become to the same level.

Meanwhile, by the sensing sensor, in the case carrying speed of theelongated sheet (15 a) located in the unit of front-end (10) is slowerthan carrying speed of the elongated sheet (15 b) located in the unit ofrear-end (10′), the main control device (50) moves the adjusting roller(35) provided between a pair of the support roller (33, 33′) to upperside, carrying speed of the elongated sheet (15 a) located in the unitof front-end (10) and the carrying speed of the elongated sheet (15 b)located in the unit of rear-end (10′) are modified and controlled to thesame level.

In other words, in the case of sensed carrying speed of the elongatedsheet (15 a) located in front-end of the unit (10) is slower thancarrying speed of the elongated sheet (15 b) located in rear-end of theunit (10′), in order to prevent snapping of the elongated sheet (15 b)carried in the unit of rear-end (10′), the adjusting roller (35),provided between a pair of the support roller (33, 33′) and wind theelongated sheet, is moved to the upper side, among the elongated sheet(15) carried from the unit (10) in front-end to the unit (10′) inrear-end, the elongated sheet (15 a), carried to outer side of the unit(10) in front-end and wound in the buffer section (31) located betweeneach of the unit (10, 10′) by the adjusting roller (35), is fastlyprovided to the unit (10′) in rear-side, carrying speed of the elongatedsheet (15 a) located in the unit of front-end (10) and the carryingspeed of the elongated sheet (15 b) located in the unit of rear end(10′) are modified and controlled to the same level, and snapping of theelongated sheet (15 b) is prevented.

According to the structure stated above, among each of the unit (10,10′), by adjusting carrying speed of the elongated sheet (15 a) carriedin the rear-end of the unit (10′), carrying speed of the elongated sheet(15 b) in rear-end of the unit (10′) and carrying speed of the elongatedsheet (15 a) in front-end of the unit (10) become to the same level.

Below statement explains operation process of the elongated sheetadjusting system of the electrospinning apparatus according to thepresent invention.

First, according to the present invention through the supply rollerprovided in the electrospinning apparatus′(1) front-end, the elongatedsheet (15) is supplied to the electrospinning apparatus′(1) unit (10).

Thus, the elongated sheet (15) which is supplied to the electrospinningapparatus′(1) unit (10) through the supply roller (3) is located on thecollector (13), the voltage generating device's (14) high voltage isoccurred on the collector (13) through the nozzle (12), polymer spinningsolution filled in spinning solution main tank (not shown) is jetted onthe elongated sheet (15) which is on the collector (13) occurring highvoltage through the nozzle block's (11) nozzle.

Here, spinning solution filled in the spinning solution main tank isconsecutively supplied in the required amount in a plurality of nozzles(12) with high voltage through the metering pump (not shown), spinningsolution supplied to each of the nozzle (12) is spun and line-focused onthe collector (13) applied high voltage through the nozzle (12), jettedon the elongated sheet (15) and nanofiber web is laminated and formed.

As stated above, the elongated sheet (15), which laminating a nanofiberweb located in the unit (10) of front-side among the electrospinningapparatus′(1) each unit (10, 10′), is carried from the unit (10) offront-side to the unit (10′) located on the rear-side by the carryingroller (17) operated by the motor's (not shown) driving and auxiliarybelt (16) driven by rotation of the feed roller (17), as the process isrepeated a nanofiber web is laminating formed on the elongated sheet(15).

In this case, among each of the unit (10, 10′) the elongated sheet (15)carried from the unit (10) in front-end to the unit in rear-end (10′) isconveyed through a pair of support roller (33, 33′) provided in thebuffer section (31) between each of the unit (10, 10′), andsimultaneously carried and wound by the adjusting roller (35) providedbetween a pair of the support roller (33, 33′)

Here, carrying speed of the elongated sheet (15) in each of the unit(10, 10′) comprises 0.2 to 100 m/s, in the case of carrying speed of theelongated sheet (15 a) located in the unit of front-side (10) andcarrying speed of the elongated sheet (15 b) located in the unit ofrear-side (10′) are same, it operates well.

However, in the case of carrying speed of the elongated sheet (15 a)located in the unit of front-side (10) and carrying speed of theelongated sheet (15 b) located in the unit of front-side (10) aredifferent, according to the elongated sheet carrying speed adjustingsystem (30) of the present invention, carrying speed of the elongatedsheet (15 a) carried from the unit (10) located in front-end among eachof the unit (10, 10′) or carrying speed of the elongated sheet (15 b)carried from the unit (10′) located in rear-end is adjusted, andcarrying speed of the elongated sheet (15 a, 15 b) going through each ofthe unit (10, 10′) are modified and controlled to the same level.

For example, if carrying speed of the elongated sheet (15 a, 15 b)carried in each of the unit (10, 10′) is 1, in the case of carryingspeed of each of the elongated sheet (15 a, 15 b) in unit (10) locatedin front-end and unit located in rear-end (10′) among each of the unit(10, 10′) is all 1, it operates well.

However, in the case of sensed carrying speed of the elongated sheet (15a) located in the unit of front-side (10) is faster than carrying speedof the elongated sheet (15 b) located in the unit of rear-side (10′) issensed, for example, in the case of the elongated sheet (15 a) in unit(10) located in the unit located in front-end among each of the unit is1, and the elongated sheet (15 b) in the unit located in rear-end is0.7, the adjusting roller (35) winding the elongated sheet is moved tothe lower side, among the elongated sheet (15) carried from the unit(10) located in front side to the unit (10′) located in rear-side, theelongated sheet (15 a), excessively carried to the buffer section (31)in the unit of front-side located between each of the unit, is pulled,carrying speed of 0.3 is modified and controlled, carrying speed of theelongated sheet (15 a) located in the unit of front side (10) andcarrying speed of the elongated sheet (15 b) located in the unit of rearside (10′) are modified and controlled to the same level, and slackingand crumpling of the elongated sheet (15 a) is prevented.

Also, sensed carrying speed of the elongated sheet (15 a) located in theunit of front side (10) is slower than carrying speed of the elongatedsheet (15 b) located in the unit of rear side (10′), for example, in thecase of the elongated sheet (15 a) in unit (10) located in front-endamong each of the unit is 0.7, and the elongated sheet (15 b) in unitlocated in rear-end is 1, the adjusting roller (35) winding theelongated sheet is moved to the lower side, among the elongated sheet(15) carried from the unit (10) located in front side to the unit (10′)located in rear-side, extra elongated sheet (15 a) wound in theadjusting roller (35) is rapidly supplied to the unit (10′) in rear end,carrying speed of 0.3 is modified and controlled, carrying speed of theelongated sheet (15 a) located in the unit of front side (10) andcarrying speed of the elongated sheet (15 b) located in the unit of rearside (10′) are modified and controlled to the same level, and snapping,breakage, and damage of the elongated sheet (15 b) is prevented.

As stated above, the elongated sheet (15), on which a nanofiber web iselectrospun, going through each of the unit (10, 10′) of theelectrospinning apparatus (1) to perform post-process such aslaminating, and the final product is manufactured.

In this case, defect-checking of air permeability of produced nanofiberis possible using an air permeability measuring device (not shown),using separate device for other post processing, process is performed,and the final product is manufactured.

Meanwhile, reference to FIG. 7 to FIG. 11, the electrospinning apparatus(1) according to the second embodiment of the present invention providedwith the elongated sheet (15) going through between nozzle (12) andnozzle block (11) connected to minus terminal and collector (13)connected to plus terminal in desired carrying speed, in order to makeit easier to desorption and carry of the elongated sheet (15) attachedto the collector (13) by electrostatic attraction, auxiliary belt (16),rotating synchronized with carrying speed of the elongated sheet (15),and auxiliary carrying device, supporting the auxiliary belt (16) andcomprising the auxiliary belt roller (17′) to assist rotation, areprovided. In this case, it is preferable the auxiliary belt roller (17′)comprising roller with low friction coefficient, if a roller with lowfriction coefficient is applied, other various rollers can be applied,and a bearing (not shown) with low friction coefficient can be provided.

Here, the nozzle block (11) comprises a plurality of nozzles, the nozzleblock's (11) polymer solution discharge toward the collector from anoutlet as nanofiber, nonofiber stacked on the elongated sheet (15), theelongated sheet (15) maintains uniform thickness and moves.

Here, according to the electrospinning apparatus (1), average diameterof nanofiber laminating formed on the elongated sheet (15) is tens tothousands nm, synthetic resin possible of electro spinning is notseparately limited otherwise, for example, polypropylene (PP),polyethylene terephthalate (PET), polyvinylidene fluoride, nylon,polyvinyl acetate, polymethyl methacrylate, polyacrylonitrile (PAN),polyurethane (PUR), polybutylene terephthalate (PBT), polyvinyl butyral,polyvinyl chloride, polyethyleneimine, polyolefins, poly (lactic acid)(PLA), polyvinyl acetate (PVAc), polyethylene naphthalate (PEN),polyamide (PA), polyvinyl alcohol (PVA), polyethylene imide (PEI),polycaprolactone (PCL), polylactic glycolic acid (PLGA), silk,cellulose, and chitosan, and among them the material of polypropylene(PP) and heat-resistant polymer matter such as polyamide, polyimide,polyamideimide, poly (meta-phenyleneisophthalamide), polysulfone,polyether ketone, polyetherimide, aromatic polyester such aspolyethylene terephthalate, polytrimethylene terephthalate, polyethylenenaphthalate, poly-phosphazenesuch as polytetrafluoroethylene,polydiphenoxyposphazene, poly-bis[2-(2-methoxyethoxy)phosphazene], andpolyurethane copolymer including polyurethane and polyether urethane,cellulose acetate, cellulose acetate butyrate, polymers of the groupconsisting of cellulose acetate propionate are used commercially andwidely, does not limited thereto.

In this case, polymer solution is solution with dissolving polymer whichis synthetic resin matter possible of electro spinning dissolved insuitable solvent, also the kind of solvent, as long as it can dissolvethe polymer, are not limited, for example, phenol, formic acid, sulfuricacid, m-cresol, trifluorineaceticanhydride/dichloromethane, water,N-methylmorpholine N-oxide, chloroform, tetrahydrofuran and aliphaticketone group such as methyl isobutyl ketone and methyl ethyl ketone,aliphatic hydroxyl group such as m-butyl alcohol, isobutyl alcohol,isopropyl alcohol, methyl alcohol, ethanol, aliphatic compound groupsuch as haxane, tetrachlorethylene, acetone, glycol group such aspropylene glycol, diethylene glycol, ethylene glycol, halogen compoundgroup such as trichloroethylene, dichloromethane, aromatic compoundgroup such as toluene, xylene, alicyclic compound group such ascyclohexanone, cyclohexane, and an ester group such as n-butylacetateand ethyl acetate, aliphatic ether group such as butylcellosolve, aceticacid 2-ethoxy ethyl ethanol, 2-ethoxyethanol, amide such asdimethylformamide, dimethylacetamide can be used, and can be used bymixing plural kinds of the solvent, the polymer solution can alsocontain an additive such as a conductivity-enhancing agent, does notlimited thereto.

Moreover, temperature of each unit (10, 10′) where polymer spinningsolution is jetted through the electrospinning apparatus (1), forexample, could be set to 25° C., and humidity of each unit (10. 10′),for example, could be set to 30%, but does not limit to this.

Meanwhile, the auxiliary carrying device (not shown) is additionallyprovided to each of the unit (10, 10′) of the electrospinning apparatus(1) according to the second embodiment of the present invention,smoothly adjusts the elongated sheet (15) carrying, the elongated sheet(15) is attached to the collector (13), and prevents polymer spinningsolution from uneven spinning due to uneven carrying.

In this case, as illustrated in FIG. 7, the auxiliary carrying devicehas the auxiliary belt (16) operated by two auxiliary belt roller (17′)rotation, each of the auxiliary belt roller (17′) comprises roller withlow friction coefficient.

Meanwhile, in the second embodiment of the present invention, though thenumber of the auxiliary carrying device's auxiliary belt roller (17′) istwo, as illustrated in FIG. 8 to FIG. 10, the number of the auxiliarycarrying device's auxiliary belt roller (17′) can be three, four orfive, and the elongated sheet (15) carrying could be smoothly adjusted.

In this case, the electrospinning apparatus (1) auxiliary carryingdevice not only assists carrying of the elongated sheet (15) attached tothe collector (13) with electrostatic attraction through the roller withlow friction coefficient, but also adjusts stack amount of nanofiberlaminated and formed on the elongated sheet (15) by adjusting theelongated sheet (15) height upper and lower side.

Here, for conditions of adjusting stack amount of nanofiber laminatedand formed on the elongated sheet (15) are voltage adjusting, adjustmentof polymer solution viscosity, adjustment of polymer solutiontemperature, adjustment of number of nozzle (12) which is outlet, andadjustment of distance between the nozzle block (11) and the elongatedsheet (15) which nanofiber is stacked, and among them the most simplemethod to adjust stack amount maintaining nanofiber matter is adjustingthe distance between the nozzle block (11) and the elongated sheet (15).Though conventional art needs separate equipment to adjust the elongatedsheet (15) location, and it is hard to control the location of theelongated sheet (15) because the elongated sheet (15)is attached to thecollector (13) with electrostatic force in conventional art, theelectrospinning apparatus (1) of the present invention is for separatingthe elongated sheet (15) with the collector (13) and carrying, theelongated sheet (15) location can be easily controlled.

In the embodiment, by adjusting the auxiliary carrying device locationto upper or lower side, the elongated sheet (15) location is changed andnanofiber stack amount is adjusted, by moving location of the auxiliarybelt roller (17′) provided in the auxiliary carrying device, theelongated sheet (15) height could be adjusted.

Also, though in the embodiment, the auxiliary carrying device ofelectrospinning apparatus (1) comprises the auxiliary belt (16) and theauxiliary belt roller (17′) with low friction coefficient, asillustrated in FIG. 11, each of the unit (10, 10′) of theelectrospinning apparatus (1) front and rear side is provided the roller(17′) with low friction coefficient, and enables to assist carrying ofthe elongated sheet (15). In the embodiment (in the second embodiment ofthe present invention), as an example of the roller with low frictioncoefficient, a roller comprising ball bearing is shown, if comprisingwith a roller with low friction coefficient, the form and composition ofa roller is not limited, more detail bearing such as rolling bearing,oil bearing, ball bearing, roller bearing, sliding bearing, sleevebearing, hydrodynamic journal bearing, hydrostatic journal bearing,pneumatic bearing, air dynamic bearing, air static bearing, and airbearing could be comprised, and roller with low friction coefficientincluding material and additives such as plastic and emulsifier could becomprised.

Meanwhile, reference to FIG. 12 to FIG. 15, the electrospinningapparatus (1) according to the third embodiment of the present inventionhas the elongated sheet (15) carrying in desired speed between thenozzle (12) and nozzle block (11) connected to minus terminal and thecollector (13) connected to plus terminal, in order to make easily ofdesorption and carrying of the elongated sheet (15) attached to thecollector (13) with electrostatic attraction, auxiliary belt (16),rotating synchronized with carrying speed of the elongated sheet (15),and auxiliary belt roller (17′), supporting the auxiliary belt (16) andassisting rotation, are provided, the auxiliary belt device (not shown)has the auxiliary belt driving device (18) as one among the auxiliarybelt roller (17′), among the auxiliary belt device's auxiliary beltroller (17′) one or two or more auxiliary belt roller (17′) is drivingroller (not shown) and the other auxiliary belt roller (17′) ispreferably comprising driven roller (not shown), but does not limit tothis.

In this case, in the auxiliary belt driving device (18) provided in eachof the unit (10, 10′, 10″, 10′″) of the electrospinning apparatus (1),the sheet slacking sensing device (19 a) which senses sagging of theelongated sheet (15), controls the speed, and receives signalcontrolling the speed is additionally connected and provided, controlsthe elongated sheet (15) carrying speed, automatically restores saggingof the elongated sheet (15), and enables mass-producing of nanofiber.

Meanwhile, as illustrated in FIG. 12, the auxiliary belt device providedin each of the unit (10, 10′) of the electrospinning apparatus (1)comprises three auxiliary belt roller (17′), among three auxiliary beltroller (17′), one is driving roller comprising the auxiliary beltdriving device (18), the other two auxiliary belt roller (17′) comprisesdriven roller, using the sheet slacking sensing device (19 a) providedbetween each of the unit (10, 10′), sagging of the elongated sheet (15)is sensed, and according to this, signal adjusting speed is transferredto the auxiliary belt driving device (18).

Here, the auxiliary belt driving device (18) including the auxiliarybelt roller (17′) preferably comprises the auxiliary belt roller (17′)and the driving device which rotates the auxiliary belt (16), theauxiliary belt driving device (18) is preferably operated by a motor.

The sheet slacking sensing device preferably comprises contact type ornoncontact type of device sensing sagging of the elongated sheet (15),preferably comprises one among optic sensor, ultrasonic sensor, imagesensor, or tension meter, as illustrated in FIG. 14, more preferably thesheet slacking sensing device (19 a) senses the location of the sheetexactly using ultrasonic sensor.

Meanwhile, in the third embodiment of the present invention, theauxiliary belt device provided in each of the unit (10, 10″) of theelectrospinning apparatus (1) comprises three auxiliary belt roller(17′), among three auxiliary belt roller (17′) one is driving rollercomprising auxiliary belt driving device (18), and the other two aredriven roller. As illustrated in FIG. 13, auxiliary belt device providedin each unit (10, 10′, 10″) comprises five auxiliary belt roller (17′),among five auxiliary belt roller (17′), one is driving roller comprisingauxiliary belt driving device (18), and the other four could be drivenroller.

According to the structure stated above, because of problem such as thesheet slacking sensing device (19 a) located between each of the unit(10, 10′, 10″) arranged in series, senses sagging of the elongated sheet(15) in noncontact type, such signal is transferred from the unit (10′,10″) located in rear-end to the auxiliary belt driving device of theunit (10, 10′) located in front-end, by enhancing the rotation speed ofthe auxiliary belt driving device (18), the elongated sheet (15) saggedin front-end and the elongated sheet (15) attached to the collector (13)are effectively pulled and transferred to rear-end.

Meanwhile, as illustrated in FIG. 15, the sheet slacking sensing device(19 a) is provided between each unit (10, 10′, 10″, 10′″) arranged inseries, where the elongated sheet is carried with desired speed anddesired direction, the elongated sheet (15) supplied from the supplyroller (3) is provided certain height and direction through theauxiliary roller (23), by the driving roller (24, 25, 26, 27), maintainsdesired carrying speed, and moves forward toward the winding roller (5).

In this case, in the case of electrostatic attraction between thecollector (13) of each of the unit (10, 10′, 10″, 10′″) and theelongated sheet (15) is bigger than feed force of each driving roller(24, 25, 26, 27), the elongated sheet (15) is attached to the collector(13), and doesn't smoothly carried to the winding roller (5), when theelongated sheet is pulled to each of the driving roller (24, 25, 26, 27)by force in the state of the elongated sheet (15) is attached, therecould be problem such as the elongated sheet (15) is ruptured.

Therefore, in each of the unit (10, 10′, 10″, 10′″), to assist carryingof the elongated sheet to each of the unit (10, 10′, 10″, 10′″), theauxiliary belt device comprises the auxiliary belt (16), the auxiliarybelt roller (17′), and auxiliary belt driving device (18) provided oneamong the auxiliary belt roller (17′), the sheet slacking sensing devicesenses sagging of the elongated sheet (15) and adjusts speed of theauxiliary belt device, thereby the elongated sheet (15) in each of theunit (10, 10′, 10″, 10′″) of the electrospinning apparatus (1) issmoothly carried.

As stated above, through each of the unit (10, 10′, 10″, 10′″) of theelectrospinning apparatus (1), the elongated sheet (15) on whichnanofiber stacked and formed finalize nanofiber-manufacture through theheating device (29), in this case heating temperature could be setdifferently according to the elongated sheet (15) or type of nanofiber.For example, through the heating device (29), it could be heated byheating temperature from 40 to 400° C.

The elongated sheet (15) passes through the heating device (29), thelocation of the elongated sheet (15) is modified in certain directionthrough the auxiliary roller (28), wound by the winding roller (5),nanofiber stacked and laminating on the elongated sheet (15) ismanufactured to nanofiber non-woven fabric.

Meanwhile, though in the third embodiment of the present invention, thesheet slacking sensing device (19 a) is provided between each of theunit (10, 10′, 10″, 10′″) of the electrospinning apparatus (1), asillustrated in FIG. 16, the air permeability measuring device (19 b)could be consecutively arranged and installed between each of the unit(10, 10′, 10″, 10′″) of the electrospinning apparatus (1).

In other words, to measure air permeability of nanofiber laminated onthe elongated sheet (15) of the electrospinning apparatus (1), the airpermeability measuring device (19 b) is each provided between each ofthe unit (10, 10′, 10″, 10′″) of the electrospinning apparatus (1)according to the fourth embodiment of the present invention.

In this case, the electrospinning apparatus (1) comprises bottom-up ortop-down electrospinning apparatus, the electrospinning apparatus (1)provided in each of the unit (10, 10′, 10″, 10′″) is installed in thecase (not shown) comprising conductor or non-conductor.

Here, in the electrospinning apparatus (1) according to the embodimentof the present invention, in each of the unit (10, 10′, 10″, 10′″), theauxiliary belt (16), provided between the collector (13) and theelongated sheet (15), and the elongated sheet (15) on which nanofiber isstacked and formed are carried in horizontal direction the auxiliarybelt roller (17′) is an automatic roller with very low frictional force,by operating the auxiliary belt (6) provided between the collector (13)and the elongated sheet (15), the elongated sheet (15) is smoothlycarried without pulling by the collector (13) with high voltage.

Meanwhile, based on air permeability value measured by the permeabilitymeasuring device (19 b) provided between each of the unit (10, 10′, 10″,10′″) of the electrospinning apparatus (1), the elongated sheet (15)carrying speed and the nozzle block (11) discharging amount arecontrolled.

In other words, in the case air permeability value of nanofiber, stackedand formed on the elongated sheet (15) passing through each of the unit(10, 10′, 10″, 10′″) of the electrospinning apparatus (1), is large,smaller air permeability can be attained by increasing discharged amountof nanofiber per unit area of the elongated sheet (15) therebyincreasing stacked amount on the elongated sheet (15). To increasedischarged amount of nanofiber per unit area of the elongated sheet(15), carrying speed of the elongated sheet (15) in the unit(10′,10″,10′″) located in rear-end of the control device (50) could beslowed, the voltage intensity of the voltage generating device (14)could be controlled, or through the nozzle block discharging amountcontrol device (60) discharged amount from the nozzle block (11) isincreased. In the case air permeability value of nanofiber, stacked andformed on the elongated sheet (15) passing through each of the unit (10,10′, 10″, 10′″) of the electrospinning apparatus (1), is small, largerair permeability can be attained by decreasing discharged amount ofnanofiber per unit area of the elongated sheet (15) thereby decreasingstacked amount on the elongated sheet (15). To decrease dischargedamount of nanofiber per unit area of the elongated sheet (15), carryingspeed of the elongated sheet (15) in the unit (10′,10″,10′″) located inrear-end of the control device (50) could be faster, the voltageintensity of the voltage generating device (14) could be controlled, orthrough the nozzle block discharging amount control device (60)discharged amount from the nozzle block (11) is decreased. Thereby,nanofiber with uniform air permeability can be stacked and formed on theelongated sheet (15).

Here, the air permeability measuring device (19 b) is preferablymeasuring device with ultrasonic method, but it is not limited to this.

In this case, in the nozzle block (11) of the electrospinning apparatus(1) according to the embodiment, as illustrated in FIG. 17, provided aplurality of nozzle (12) is provided, a plurality of tubular body (43)having the nozzle (12) for spinning polymer spinning solution upward ordownward from the outlet (not shown) is arranged and installed, polymerspinning solution spun from the plurality of nozzle (12) outlet could beoverflow and reused, through the nozzle block discharging amount controldevice (60) connected to the tubular body (43) having the plurality ofnozzle (12) with the nozzle block discharging amount control deviceconnection (61), polymer spinning solution discharging amount from thepolymer solution storage tank (44) connected to each of the nozzle (12)with the polymer solution circulation pipe (45) could be automaticallycontrolled.

Meanwhile, air permeability of the elongated sheet (15) on whichnanofiber is stacked and formed means air permeability value measured inthe state of nanofiber layer laminated and formed on the elongated sheet(15) on which nanofiber is stacked and formed.

According to the structure stated above, in the case the nanofiber airpermeability deviation is less than a desired value, the main controldevice (50) doesn't change carrying speed from initial value, in thecase the deviation is more than a desired value, the main control device(50) could be controlled by changing carrying speed from initial value,and carrying speed control can be simplified.

Moreover, in the case of the nanofiber air permeability deviation isless than a desired value, the nozzle block discharging amount controldevice (60) doesn't change the nozzle block (11) discharging amount frominitial value, and simultaneously doesn't change voltage intensity frominitial value. In the case of the nanofiber air permeability deviationis more than a desired value, through the nozzle block dischargingamount control device (60) and the main control device (50), the nozzleblock (11) discharging amount and voltage intensity could be controlledby changing from initial value, control of the nozzle block (11)discharging amount and voltage intensity could be simplified.

Below statement specifically explains the embodiment. However, theembodiment is an example of the present invention, the present inventionscope is not limited to this.

1. Air Permeability Measurement

Permeability measuring tester does reciprocating motion in desired cycleaccording along the elongated sheet (15) width direction, through anultrasonic sensor, measures the elongated sheet (15) air permeability.Air permeability measurement according to the air permeability measuringtester is carried out, for example, every 10 ms.

2. Average Air Permeability (P)

Take an average of measured air permeability in desired cycle using thepermeability measuring tester, and calculate average air permeability.

3. Deviation (ΔP)

A deviation between the average air permeability (P) and desired goalair permeability (ΔP).

4. Carrying Speed (V) Control

Based on the deviation (ΔP), carrying speed (V) is controlled.

5. Nozzle Block Discharging Amount and Voltage Control

Based on the deviation (ΔP), nozzle block discharging amount and voltageare controlled.

Embodiment 1

Installing five units, the elongated sheet (15) is carried in desiredcarrying speed from the supply roller (3) toward the winding roller (5),laminating nanofiber in order.

In this case, measuring air permeability of the elongated sheet (15)laminating formed nanofiber from the unit (10, 10′, 10″) of front-endaccording to the electrospinning apparatus, simultaneously based onmeasured air permeability by the air permeability measuring device (19b), carrying speed is controlled, after laminating nanofiber on theelongated sheet (15) consecutively in the unit (10′, 10″, 10′″) ofrear-end, air permeability is measured, repeatedly carrying speed iscontrolled, and nanofiber is laminated.

Embodiment 2

Installing five units, the elongated sheet (15) is carried in desiredcarrying speed from the supply roller (3) toward the winding roller (5),laminating nanofiber in order.

In this case, measuring air permeability of the elongated sheet (15)laminating formed nanofiber from each of the unit (10, 10′, 10″, 10′″),simultaneously based on measured air permeability according to the airpermeability measuring device (19 b), the nozzle block (11) dischargingamount and the voltage generating device (14) voltage intensity arecontrolled, after laminating nanofiber on the elongated sheet (15)consecutively in the unit of rear-end (10′, 10″, 10′″), air permeabilityis measured, repeatedly the nozzle block (11) discharging amount and thevoltage generating device (14) voltage intensity are controlled, andnanofiber is laminated.

Comparative Example 1

Installing five units, the elongated sheet (15) is carried in desiredcarrying speed from the supply roller (11) toward the winding roller(12), laminating nanofiber in order.

After successively laminating nanofiber, carrying speed (V) is notcontrolled, after the last unit, air permeability is measured.

TABLE 1 Comparative Embodiment 1 Embodiment 2 example 1 Control number 43 0 Final air +1 +0.5 +11.4 permeability deviation(ΔP)

As known in the result, through the main control device (50) of theembodiment, by controlling the elongated sheet (15) carring speed andthe voltage generating device (14) voltage intensity, simultaneously bycontrolling the nozzle block (11) discharging amount through the nozzleblock discharging amount control device (60), nanofiber with uniform airpermeability could be manufactured.

Meanwhile, in the fourth embodiment of the present invention, the airpermeability measuring device (19 b) is provided between each of theunit (10, 10′, 10″, 10′″) of the electrospinning apparatus (1), asillustrated in FIG. 18, the thickness measurement device (19 c) could besuccessively arranged and installed between each of the unit (10, 10′,10″, 10′″) of the electrospinning apparatus (1).

In other words, to measure the thickness of nanofiber laminated andformed on the elongated sheet (15) of the electrospinning apparatus (1),the thickness measurement device (19 c) is each provided between each ofthe unit (10, 10′, 10″, 10′″) of the electrospinning apparatus (1)according to the fifth embodiment of the present invention.

According to the structure stated above, based on the thickness valuemeasured by the thickness measurement device (19 c) provided betweeneach of the unit (10, 10′, 10″, 10′″) of the electrospinning apparatus(1), the elongated sheet (15) carrying speed and the nozzle bock (11)discharging amount can be controlled.

In other words, in the case thickness value of nanofiber, stacked andformed on the elongated sheet (15) passing through each of the unit (10,10′, 10″, 10′″) of the electrospinning apparatus (1), is measuredthinner than deviation, thicker thickness value can be attained byincreasing discharged amount of nanofiber per unit area of the elongatedsheet (15) thereby increasing stacked amount on the elongated sheet(15).

To increase discharged amount of nanofiber per unit area of theelongated sheet (15), carrying speed of the elongated sheet (15) in theunit (10′,10″,10′″) located in rear-end of the control device (50) couldbe slowed, the voltage intensity of the voltage generating device (14)could be controlled, or through the nozzle block discharging amountcontrol device (60) discharged amount from the nozzle block (11) couldbe increased. In the case thickness value of nanofiber, stacked andformed on the elongated sheet (15) passing through each of the unit (10,10′, 10″, 10′″) of the electrospinning apparatus (1), is measuredthicker than deviation, thinner thickness value can be attained bydecreasing discharged amount of nanofiber per unit area of the elongatedsheet (15) thereby decreasing stacked amount on the elongated sheet(15). To decrease discharged amount of nanofiber per unit area of theelongated sheet (15), carrying speed of the elongated sheet (15) in theunit (10′,10″,10′″) located in rear-end of the control device (50) couldbe faster, the voltage intensity of the voltage generating device (14)could be controlled, or through the nozzle block discharging amountcontrol device (60) discharged amount from the nozzle block (11) isdecreased. Thereby, nanofiber with uniform thickness can be stacked andformed on the elongated sheet (15).

Here, the thickness measurement device (19 c) is arranged in oppositesides between the elongated sheet (15), using ultrasonic measuringmethod, thickness measuring tester (not shown), which measures thedistance to the elongated sheet (15) and comprising a pair ofultrasonic, longitudinal wave, and transverse wave measuring method, isprovided, based on measured distance according to the thicknessmeasurement device (19 c), the elongated sheet (15) thickness could becalculated.

In other words, the thickness measurement device (19 c) uses ultrasoniclongitudinal wave and transverse wave to calculate the thickness of asubject. The thickness measurement device (19 c) projects ultrasoniclongitudinal wave and transverse wave together on the elongated sheet(15) laminating nanofiber, after measuring reciprocating motion time ofeach ultrasonic signal of longitudinal wave and transverse wave from theelongated sheet (15), in other words, after measuring each propagationtime of longitudinal wave and transverse wave, the thickness of asubject can be calculated from predetermined formula using propagationtime of measured longitudinal wave and transverse wave, propagationspeed of measured longitudinal wave and transverse wave in referencetemperature of the elongated sheet (15) laminating nanofiber, and atemperature constant of propagation speed of longitudinal wave andtransverse wave.

In other words, in the thickness measurement device (19 c) usingultrasonic longitudinal wave and transverse wave, after measuring eachpropagation time of longitudinal wave and transverse wave, the thicknessof the elongated sheet (15) laminating nanofiber can be calculated frompredetermined formula using propagation time of measured longitudinalwave and transverse wave, propagation speed of measured longitudinalwave and transverse wave in reference temperature of the elongated sheet(15) laminating nanofiber, and a temperature constant of propagationspeed of longitudinal wave and transverse wave. The thickness could beaccurately measured even in the state of uneven inner temperature byself compensating error made by change of propagation speed according tochange of temperature, thereby the thickness could be accuratelymeasured even though there is temperature distribution in any forminside nanofiber in the thickness measurement device (19 c).

In the embodiment, in this case in the nozzle block (11) of theelectrospinning apparatus (1) according to the embodiment, asillustrated in FIG. 17, provided a plurality of nozzle (12) is provided,a plurality of tubular bodies (43) having the nozzle (12) for spinningpolymer spinning solution upward or downward from the outlet (not shown)is arranged and installed, polymer spinning solution spun from theplurality of nozzle (12) outlet could be overflow and reused, throughthe nozzle block discharging amount control device (60) connected to thetubular body (43) having the plurality of nozzle (12) with the nozzleblock discharging amount control device connection (61), polymerspinning solution discharging amount from the polymer solution storagetank (44) connected to each of the nozzle (12) with the polymer solutioncirculation pipe (45) could be automatically controlled.

Here, thickness of the elongated sheet (15) on which nanofiber isstacked and formed means measured thickness value in state of nanofiberlayer laminated and formed on the elongated sheet (15) on whichnanofiber is stacked and formed.

According to the structure stated above, in the case the nanofiberthickness deviation is less than a desired value, the main controldevice (50) doesn't change carrying speed from the initial value, and inthe case the thickness deviation is more than a desired value, the maincontrol device (50) controls to change carrying speed from the initialvalue, so carrying speed control are simplified.

Moreover, in the case of nanofiber thickness deviation is less than adesired value, the nozzle block discharging amount control device (60)doesn't change the nozzle block (11) discharging amount from the initialvalue, simultaneously the main control device (50) doesn't changevoltage intensity from the initial value, and in the case of thethickness deviation is more than a desired value, through the nozzleblock discharging amount control device (60) and the main control device(50), the nozzle block (11) discharging amount and voltage intensitycould be controlled to be changed from the initial value, so the nozzleblock (11) discharging amount and voltage intensity control aresimplified.

Below statement more specifically explains than the embodiment. However,the embodiment is merely an example of the present invention, thepresent invention scope is not limited to this.

1. Goal Thickness Measurement (d₀)

Manufactured nanofiber thickness is set to goal thickeness.

2. Thickness Measurement

The thickness measurement tester does reciprocating motion in desiredcycle along the elongated sheet (15) width direction, through anultrasonic sensor, measures the elongated sheet (5) thickness. Thicknessmeasurement using the thickness measurement device is carried, forexample, every 10 ms.

3. Average Thickness (d)

Take an average of measured thickness measured by the thicknessmeasurement device in desired cycle, and calculate average thickness.

4. Deviation (Δd)

A deviation between the average thickness (d) and desired goal thickness(d₀).

5. Carrying Speed (V) Control

Based on the deviation (Δd), carrying speed (V) is controlled.

6. Nozzle Block Discharging Amount and Voltage Control

Based on the deviation (Δd), nozzle block discharging amount and voltageare controlled.

Embodiment 3

Installing five units, the elongated sheet (15) is carried in desiredcarrying speed (V) from the supply roller (3) toward the winding roller(5), laminating nanofiber in order.

In this case, measuring thickness of the elongated sheet (15) on whichnanofiber is laminated and formed from the unit of front-end (10, 10′,10″) according to the electrospinning apparatus, simultaneously based onmeasured thickness according to the thickness measurement device (19 c),carrying speed is controlled, after laminating nanofiber on theelongated sheet (15) consecutively from the unit of rear-end (10, 10′,10″), thickness is measured, repeatedly carrying speed is controlled,and nanofiber is laminated.

Embodiment 4

Installing five units, the elongated sheet (15) is carried in desiredcarrying speed (V) from the supply roller (3) toward the winding roller(5), laminating nanofiber in order.

In this case, measuring thickness of the elongated sheet (15) on whichnanofiber is laminated and formed from each of the unit (10, 10′, 10″,10′″), simultaneously based on measured thickness according to thethickness measurement device (19 c), the nozzle block (11) dischargingamount and the voltage generating device (14) voltage intensity arecontrolled, after laminating nanofiber on the elongated sheet (15)consecutively from the unit of rear-end (10, 10′, 10″), thickness ismeasured, repeatedly the nozzle block (11) discharging amount and thevoltage generating device (14) voltage intensity are controlled, andnanofiber is laminated.

Comparative Example 2

Installing five units, the elongated sheet (15) is carried in desiredcarrying speed from the supply roller (11) toward the winding roller(12), laminating nanofiber in order.

After successively laminating nanofiber, carrying speed is notcontrolled, after the last unit, thickness is measured.

TABLE 2 Comparative Embodiment 3 Embodiment 4 example 2 Control number 54 0 Final thickness 0.1 +0.3 +13.3 deviation(Δd)

As known in the result, through the main control device (50) of theembodiment, by controlling the elongated sheet (15) carrying speed andthe voltage generating device (14) voltage intensity, simultaneously bycontrolling the nozzle block (11) discharging amount through the nozzleblock discharging amount control device (60), nanofiber with uniformthickness could be manufactured.

While the present invention is described with reference to particularembodiments thereof, it will be understood by those skilled in the artthat variations or amendment may be made therein without departing fromthe sprit and scope of the invention. The scope of the present inventionis not limited by those variations or amendments, but by the followingclaims.

1. An electrospinning apparatus for producing nanofiber, comprising: oneor more in series arranged unit; a case is provided in the unit andcomprising electric conductor or non-conductor; a nozzle block isprovided in the case, in which a plurality of nozzles in pin form arearranged; a collector collecting spun and jetted polymer spinningsolution which is located and installed over the nozzle block with apredetermined distance apart; a voltage generating device which connectsminus terminal to the nozzle block and plus terminal to the collector;an elongated sheet is located between the nozzle block and thecollector, and is moved in desired speed, on which polymer spinningsolution nanofiber discharged from the nozzle block is stacked andlaminated; an auxiliary belt for moving the elongated sheet in desiredcarrying speed; and an auxiliary belt roller for supporting andsimultaneously operating the auxiliary belt; and thereby jettingspinning solution on the elongated sheet in upper side of the collectorthrough the nozzle in each of the units, further comprising an elongatedsheet carrying speed adjusting system, including buffer section formedbetween each of the unit, a pair of support roller supporting theelongated sheet on the buffer section, and one or more of adjustingroller provided between a pair of the support roller, movable betweenupper or lower side, winding the elongated sheet, thereby the carryingspeed of the elongated sheet according to each of the unit is adjusted.2. The electrospinning apparatus of claim 1, wherein the elongated sheetcarrying speed adjusting system further comprises a sensing sensor forsensing carrying speed of the elongated sheet inside each of the unit,and a main control device which controls movement of an adjusting rolleraccording to sensed carrying speed of the elongated sheet in each unitby the sensing sensor.
 3. The electrospinning apparatus of claim 2,wherein in the case sensed carrying speed of the elongated sheet locatedin the unit of front-end is faster than sensed carrying speed of theelongated sheet located in the unit of rear-end by the sensing sensor,the main control device moves the adjusting roller provided between apair of the support roller to lower side, so that carrying speed of theelongated speed located in the unit of front-end and the carrying speedof the elongated sheet located in the unit of rear-end are modified andcontrolled to the same level.
 4. The electrospinning apparatus of claim2, wherein in the case carrying speed of the elongated sheet located inthe unit of front-end is slower than speed of the elongated sheetlocated in the unit of rear-end by the sensing sensor, the main controldevice moves the adjusting roller provided between a pair of the supportroller to upper side, so that speed of the elongated speed located inthe unit of front-end and the carrying speed of the elongated sheetlocated in the unit of rear-end are modified and controlled to the samelevel.
 5. An electrospinning apparatus for producing nanofiber,comprising: one or more in series arranged unit; a case is provided inthe unit and comprising electric conductor or non-conductor; a nozzleblock is provided in the case, in which a plurality of nozzles in pinform are arranged; a collector collecting spun and jetted polymerspinning solution which is located and installed over the nozzle blockwith a predetermined distance apart; a voltage generating device whichconnects minus terminal to the nozzle block and plus terminal to thecollector; an elongated sheet is located between the nozzle block andthe collector, and is moved in desired speed, on which polymer spinningsolution nanofiber discharged from the nozzle block is stacked andlaminated; an auxiliary belt for moving the elongated sheet in desiredcarrying speed; and an auxiliary belt roller for supporting andsimultaneously operating the auxiliary belt, wherein the auxiliary beltroller comprising a roller with low friction coefficient so that assiststhe carrying of the elongated sheet without separate driving device. 6.The electrospinning apparatus of claim 5, wherein the auxiliary beltroller is provided with one or more the auxiliary belt rollers.
 7. Theelectrospinning apparatus of claim 5, wherein the auxiliary belt rolleris selected from the group consisting of low friction coefficientrolling bearing, oil bearing, ball bearing, roller bearing, slidingbearing, sleeve bearing, hydrodynamic journal bearing, hydrostaticjournal bearing, pneumatic bearing, air dynamic bearing, air staticbearing, or air bearing.
 8. The electrospinning apparatus of claim 5,wherein nanofiber discharging amount staked on the elongated sheet isadjusted by adjusting the auxiliary belt roller upper and lower level.9. An electrospinning apparatus for producing nanofiber, comprising: oneor more in series arranged unit; provided in the unit, a case comprisingelectric conductor or non-conductor; provided in the case, a nozzleblock which arranges a plurality of nozzles in pin form; a collectorcollecting spun and jetted polymer spinning solution which is locatedand installed over the nozzle block with a predetermined distance apart;a voltage generating device which connects minus terminal to the nozzleblock and plus terminal to the collector; an elongated sheet locatedbetween the nozzle block and the collector, moves in desired speed, andpolymer spinning solution nanofiber discharged from the nozzle block isstacked and laminated on; an auxiliary belt which moves the elongatedsheet in desired carrying speed; and an auxiliary belt roller whichsupports and simultaneously operates the auxiliary belt, furthercomprising a sheet slacking sensing device which senses slacking of theelongated sheet in front and rear side of each unit; and an auxiliarybelt driving device which receives signal from the auxiliary beltdriving device and controls the speed of the auxiliary belt roller ineach unit.
 10. The electrospinning apparatus of claim 9, wherein thesheet slacking sensing device is one among optic sensor, ultrasonicsensor, image sensor, or tension meter. Also, the auxiliary belt drivingdevice is motor.
 11. An electrospinning apparatus for producingnanofiber, comprising: one or more in series arranged unit; a case isprovided in the unit and comprising electric conductor or non-conductor;a nozzle block is provided in the case, in which a plurality of nozzlesin pin form are arranged; a collector collecting spun and jetted polymerspinning solution which is located and installed over the nozzle blockwith a predetermined distance apart; a voltage generating device whichconnects minus terminal to the nozzle block and plus terminal to thecollector; an elongated sheet is located between the nozzle block andthe collector, and is moved in desired speed, on which polymer spinningsolution nanofiber discharged from the nozzle block is stacked andlaminated; an auxiliary belt for moving the elongated sheet in desiredcarrying speed; and an auxiliary belt roller for supporting andsimultaneously operating the auxiliary belt, further comprising thesheet slacking sensing device for sensing the slacking of the elongatedsheet in front and rear side of each of the unit.
 12. Theelectrospinning apparatus of claim 11, wherein the sheet slackingsensing device is one among optic sensor, ultrasonic sensor, imagesensor, or tension meter, and the auxiliary belt driving device ismotor.
 13. An electrospinning apparatus for producing nanofiber,comprising: one or more in series arranged unit; a case is provided inthe unit and comprising electric conductor or non-conductor; a nozzleblock is provided in the case, in which a plurality of nozzles in pinform are arranged; a collector collecting spun and jetted polymerspinning solution which is located and installed over the nozzle blockwith a predetermined distance apart; a voltage generating device whichconnects minus terminal to the nozzle block and plus terminal to thecollector; an elongated sheet is located between the nozzle block andthe collector, and is moved in desired speed, on which polymer spinningsolution nanofiber discharged from the nozzle block is stacked andlaminated; an auxiliary belt for moving the elongated sheet in desiredcarrying speed; and an auxiliary belt roller for supporting andsimultaneously operating the auxiliary belt, further comprising airpermeability measuring device for measuring air permeability ofnanofiber laminating formed on the elongated sheet of each unit isinstalled, so that carrying speed of the elongated sheet laminatingforming nanofiber is controlled, or the nozzle block discharge amount iscontrolled, or the voltage generating device voltage is controlled. 14.The electrospinning apparatus of claim 13, wherein the elongated sheetcarrying speed control or the nozzle block discharging amount control orthe voltage generating device voltage control is based on deviationbetween air permeability measured from the air permeability measuringdevice and desired goal air permeability.
 15. The electrospinningapparatus of claim 13, wherein the air permeability measuring devicemeasures air permeability of nanofiber laminating forming on theelongated sheet by ultrasonic wave.
 16. An electrospinning apparatus forproducing nanofiber, comprising: one or more in series arranged unit; acase is provided in the unit and comprising electric conductor ornon-conductor; a nozzle block is provided in the case, in which aplurality of nozzles in pin form are arranged; a collector collectingspun and jetted polymer spinning solution which is located and installedover the nozzle block with a predetermined distance apart; a voltagegenerating device which connects minus terminal to the nozzle block andplus terminal to the collector; an elongated sheet is located betweenthe nozzle block and the collector, and is moved in desired speed, onwhich polymer spinning solution nanofiber discharged from the nozzleblock is stacked and laminated; an auxiliary belt for moving theelongated sheet in desired carrying speed; and an auxiliary belt rollerfor supporting and simultaneously operating the auxiliary belt, furthercomprising a thickness measurement device for measuring thickness ofnanofiber laminating forming on the elongated sheet in each unit, sothat carrying speed of the elongated sheet laminating forming nanofiberis controlled, or the nozzle block discharge amount is controlled, orthe voltage generating device voltage is controlled.
 17. Theelectrospinning apparatus of claim 16, wherein the elongated sheetcarrying speed control or the nozzle block discharge amount control orthe voltage generating device voltage control is based on deviationbetween thickness measured from the thickness measuring device anddesired goal thickness.
 18. The electrospinning apparatus of claim 16,wherein the thickness measurement device measures thickness of nanofiberlaminating forming on the elongated sheet by ultrasonic, longitudinalwave and transverse wave.